remove thesaurus indexer CustomAction

It was never integrated and used. If we made the effort to integrate it,
Windows installer would be a few megabytes smaller, because indexes of
thesauri would be generated in install time (instead of packaging
pre-generated indexes).

However, the cons are:
* untested
* presumably slows down instal process which is slow already
* adds complexity to installer which is too complex already
* indexes will not be there in case of administrative install (QA)
* bad experiences with CustomActions that manipulate the installed
  application (various, weird permission problems)

Change-Id: I3989b835b1250718bc03107a3807d091e7a9aa0e

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